1213421204 has 6 divisors (see below), whose sum is σ = 2123487114. Its totient is φ = 606710600.

The previous prime is 1213421173. The next prime is 1213421207. The reversal of 1213421204 is 4021243121.

It can be written as a sum of positive squares in only one way, i.e., 642115600 + 571305604 = 25340^2 + 23902^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213421207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151677647 + ... + 151677654.

It is an arithmetic number, because the mean of its divisors is an integer number (353914519).

Almost surely, 2^1213421204 is an apocalyptic number.

It is an amenable number.

1213421204 is a deficient number, since it is larger than the sum of its proper divisors (910065910).

1213421204 is a wasteful number, since it uses less digits than its factorization.

1213421204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303355305 (or 303355303 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1213421204 is about 34834.1959000061. The cubic root of 1213421204 is about 1066.6056009746.

Adding to 1213421204 its reverse (4021243121), we get a palindrome (5234664325).

The spelling of 1213421204 in words is "one billion, two hundred thirteen million, four hundred twenty-one thousand, two hundred four".